We don't really eat fast food type stuff, but I did a bit when I travelled and the correct answer is a good Potbelly. I would grab them a couple times a week when I was up north. Great hot sandwiches and soups. I tried the one on Johnson drive that closed and it was terrible every time. It was odd, because I love Potbelly. My other answer is based on a sandwich you can eat while driving. Jimmy Johns was my go to. Very simple and delicious and it didn't get all over me when driving.